INFLUENCE OF BROKEN ROTOR BARS LOCATION IN THE SQUIRREL CAGE INDUCTION MOTOR USING FINITE ELEMENT METHOD

It is well known that the number of broken bars and varying load affect on the amplitudes of specific harmonic components  in the process analysis of induction motors under broken rotor bars. The location of broken bars is an important factor which affects the diagnosis of the broken bars defect. In this paper the simulation is determinate for different cases for distribution of broken bars under induction motor pole in order to show the impact of broken bars location upon the amplitude of harmonic fault. The simulation results are obtained by using time stepping finite elements (TSFE) method. The geometrical characteristics of motor, the effects of slotting and the magnetic saturation of lamination core are included in induction motor model

INFLUENCE OF BROKEN ROTOR BARS LOCATION IN THE SQUIRREL CAGE INDUCTION MOTOR USING FINITE ELEMENT METHOD

It is well known that the number of broken bars and varying load affect on the amplitudes of specific harmonic components in the process analysis of induction motors under broken rotor bars. The location of broken bars is an important factor which affects the diagnosis of the broken bars defect. In this paper the simulation is determinate for different cases for distribution of broken bars under induction motor pole in order to show the impact of broken bars location upon the amplitude of harmonic fault. The simulation results are obtained by using time stepping finite elements (TSFE) method. The geometrical characteristics of motor, the effects of slotting and the magnetic saturation of lamination core are included in induction motor model

Detection of Static Eccentricity Fault in Saturated Induction Motors by Air-Gap Magnetic Flux Signature Analysis Using Finite Element Method

Unfortunately, motor current signature analysis (MCSA) cannot detect the small degrees of the purely static eccentricity (SE) defects, while the air-gap magnetic flux signature analysis (FSA) is applied successfully. The simulation results are obtained by using time stepping finite elements (TSFE) method. In order to show the impact of magnetic saturation upon the diagnosis of SE fault, the analysis is carried out for saturated induction motors. The index signatures of static eccentricity fault around fundamental and PSHs are detected successfully for saturated motor

Behavior of Enzymatic Membranes Under Pressure: Effect of Enzyme Location

Enzyme immobilized membranes combine catalysis and separation functions. Their application in large-scale continuous processes requires knowing the behavior under pressure. Also, the effects of enzyme location on the mass transfer limitation, membranes’ stability, and filtration performance should be investigated. In this study, urease (URE) and trypsin (TRY) enzymes were physically immobilized in/on the surface of a polyacrylonitrile (AN69) membrane through layer-by-layer (LbL) self-assembly method using polyethylenemine (PEI) and sodium-alginate (ALG) as cationic and anionic polyelectrolytes respectively. URE, located on the membrane’s surface, degraded urea in a reaction-controlled regime, and its immobilization did not significantly change the hydraulic permeability. On the other hand, the TRY enzyme attached to the membrane’s pores reduced the permeability and degraded the BAPNA in a diffusion-controlled region. In TRY immobilized membranes, the conversion increased linearly with the transmembrane pressure, while in URE immobilized ones, conversion was maximum at 1 bar. Sandwiching the enzymes between two polyelectrolytes resulted in the highest catalytic activities. This configuration maintained most of the URE activity in the long-term filtration, but it did not help prevent TRY’s activity loss. © 2024 by author(s)